<template>
  <div class="relative inline-flex">
    <button
      ref="trigger"
      class="w-8 h-8 flex items-center justify-center bg-slate-100 hover:bg-slate-200 dark:bg-slate-700 dark:hover:bg-slate-600/80 rounded-full"
      :class="{ 'bg-slate-200': dropdownOpen }"
      aria-haspopup="true"
      @click.prevent="dropdownOpen = !dropdownOpen"
      :aria-expanded="dropdownOpen"
    >
      <span class="sr-only">Info</span>
      <svg class="w-4 h-4" viewBox="0 0 16 16" xmlns="http://www.w3.org/2000/svg">
        <path class="fill-current text-slate-500 dark:text-slate-400" d="M8 0C3.6 0 0 3.6 0 8s3.6 8 8 8 8-3.6 8-8-3.6-8-8-8zm0 12c-.6 0-1-.4-1-1s.4-1 1-1 1 .4 1 1-.4 1-1 1zm1-3H7V4h2v5z" />
      </svg>
    </button>
    <transition
      enter-active-class="transition ease-out duration-200 transform"
      enter-from-class="opacity-0 -translate-y-2"
      enter-to-class="opacity-100 translate-y-0"
      leave-active-class="transition ease-out duration-200"
      leave-from-class="opacity-100"
      leave-to-class="opacity-0"
    >
      <div v-show="dropdownOpen" class="origin-top-right z-10 absolute top-full min-w-44 bg-white dark:bg-slate-800 border border-slate-200 dark:border-slate-700 py-1.5 rounded shadow-lg overflow-hidden mt-1"  :class="align === 'right' ? 'right-0' : 'left-0'">
        <div class="text-xs font-semibold text-slate-400 dark:text-slate-500 uppercase pt-1.5 pb-2 px-3">Need help?</div>
        <ul
          ref="dropdown"
          @focusin="dropdownOpen = true"
          @focusout="dropdownOpen = false"
        >
          <li>
            <router-link class="font-medium text-sm text-indigo-500 hover:text-indigo-600 dark:hover:text-indigo-400 flex items-center py-1 px-3" to="#0" @click="dropdownOpen = false">
              <svg class="w-3 h-3 fill-current text-indigo-300 dark:text-indigo-500 shrink-0 mr-2" viewBox="0 0 12 12">
                <rect y="3" width="12" height="9" rx="1" />
                <path d="M2 0h8v2H2z" />
              </svg>
              <span>Documentation</span>
            </router-link>
          </li>
          <li>
            <router-link class="font-medium text-sm text-indigo-500 hover:text-indigo-600 dark:hover:text-indigo-400 flex items-center py-1 px-3" to="#0" @click="dropdownOpen = false">
              <svg class="w-3 h-3 fill-current text-indigo-300 dark:text-indigo-500 shrink-0 mr-2" viewBox="0 0 12 12">
                <path d="M10.5 0h-9A1.5 1.5 0 000 1.5v9A1.5 1.5 0 001.5 12h9a1.5 1.5 0 001.5-1.5v-9A1.5 1.5 0 0010.5 0zM10 7L8.207 5.207l-3 3-1.414-1.414 3-3L5 2h5v5z" />
              </svg>
              <span>Support Site</span>
            </router-link>
          </li>
          <li>
            <router-link class="font-medium text-sm text-indigo-500 hover:text-indigo-600 dark:hover:text-indigo-400 flex items-center py-1 px-3" to="#0" @click="dropdownOpen = false">
              <svg class="w-3 h-3 fill-current text-indigo-300 dark:text-indigo-500 shrink-0 mr-2" viewBox="0 0 12 12">
                <path d="M11.854.146a.5.5 0 00-.525-.116l-11 4a.5.5 0 00-.015.934l4.8 1.921 1.921 4.8A.5.5 0 007.5 12h.008a.5.5 0 00.462-.329l4-11a.5.5 0 00-.116-.525z" />
              </svg>
              <span>Contact us</span>
            </router-link>
          </li>
        </ul>
      </div> 
    </transition>
  </div>
</template>

<script>
import { ref, onMounted, onUnmounted } from 'vue'

export default {
  name: 'DropdownHelp',
  props: ['align'],
  setup() {

    const dropdownOpen = ref(false)
    const trigger = ref(null)
    const dropdown = ref(null)

    // close on click outside
    const clickHandler = ({ target }) => {
      if (!dropdownOpen.value || dropdown.value.contains(target) || trigger.value.contains(target)) return
      dropdownOpen.value = false
    }

    // close if the esc key is pressed
    const keyHandler = ({ keyCode }) => {
      if (!dropdownOpen.value || keyCode !== 27) return
      dropdownOpen.value = false
    }

    onMounted(() => {
      document.addEventListener('click', clickHandler)
      document.addEventListener('keydown', keyHandler)
    })

    onUnmounted(() => {
      document.removeEventListener('click', clickHandler)
      document.removeEventListener('keydown', keyHandler)
    })

    return {
      dropdownOpen,
      trigger,
      dropdown,
    }
  }
}
</script>